Here is an uncommon manual wind Omega Seamaster calendar watch. The factory original finish dial is absolutely gorgeous and in excellent condition. This has to be one of the cleanest and nicest black dial. Professionally serviced manual wind movement working strong and accurate. Calendar feature changes correctly. Omega caliber 610 with serial number 21124330 dating this watch to 1964. The original unpolished solid stainless steel case measures 33.5mm across excluding the crown by 40.5mm lug tip to lug tip. Original signed crown. The case model is 136.005. Brand new crystal. Brand new case back gasket. The watch is ready for daily wear and will come with a high quality 18mm new genuine leather strap. Wrist size in photo is 6 inches.